While the trinity, or the triune God is never explicitly spelled out in scripture, it is hinted at in so many places:

Yes, Jesus Christ is fully God and fully man:

This emphasizes who was, is, and will be performing the salvation, as was written in Philippians 1:5-6 “ For your fellowship in the gospel from the first day (past) until now (present); 6 Being confident of this very thing, that he which hath begun a good work in you will perform it (future) until the day of Jesus Christ:”.